body {
    margin: 0;
    padding: 0;
    background: #f1f1f1;
}

#menu {
    padding: 0;
    margin: 350px 0 0;;
}

#menu li {
    list-style: none;
    display: inline-block;
}

#menu li a {
    text-decoration: none;
    position: relative;
    color: #313131;
    font-size: 50px;
    font-weight: 700;
    font-family: sans-serif;
    display: block;
    overflow: hidden;
    transition: 0.7s all;
    padding: 14px 30px;
    text-transform: uppercase;
}

#menu li a:before {
    content: '';
    width: 60px;
    position: absolute;
    border-bottom: 8px solid #313131;
    bottom: 0;
    right: 350px;
    transition: 0.7s all;
}

#menu li a:hover:before {
    right: 0;
}
